Method for the preparation of carbonates by a continuous process

Details Method for the preparation of carbonates by a continuous process Method for the preparation of carbonates by a continuous process

1998-12-22

2000-03-07

Ambrose, Michael G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carbonate esters

558271, 558272, 558273, C07C 6800

Patent

active

060342625

ABSTRACT:
A continuous flow process for converting hydroxyaromatic compounds to diaryl carbonates by reaction with oxygen and carbon monoxide in the presence of a catalyst system typically comprising a group VIIIB metal or compound thereof, an inorganic co-catalyst, an organic co-catalyst and a hexaalkylguanidinium bromide or chloride, preferably bromide, wherein at least two components of the catalyst system, preferably lead oxide and hexaalkylguanidinium bromide, are introduced separately into the reactor.

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patent: 5726340 (1998-03-01), Takagi et al.
patent: 5760272 (1998-06-01), Pressman et al.

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